Hello! Just recently I had to reinstall Thunderbird again (bought a new hard disk), but since then when I send an email so someone and get a message back and we go on back and forth, so you have 3 or more messages, then they are added together like they are folded together. I don't like this and want to turn this off, but I don't know how to. Can anyone help? See attachment. Thanks in advance! Have a great day!